function checkAge(data) { // 栈里面的那个地址指针不相同
    if (data === { age: 18 }) {
      console.log("You are an adult!");
    } else if (data == { age: 18 }) {
      console.log("You are still an adult.");
    } else {
      console.log(`Hmm.. You don't have an age I guess`);
    }
  }
  
  checkAge({ age: 18 }); // Hmm.. You don't have an age I guess